Search found 2044 matches

by stevestrong
Fri Feb 02, 2018 9:30 pm
Forum: General discussion
Topic: How many fps can I expect if I use a 128x64 display and a blue pill?
Replies: 21
Views: 330

Re: How many fps can I expect if I use a 128x64 display and a blue pill?

You did not tell us the most important information: how is your LCD driven: over SPI? I2C? Parallel 8 bit? USART?
by stevestrong
Fri Feb 02, 2018 5:53 pm
Forum: STM32F103 Boards
Topic: ebay 103c8t6 oled, nrf24, esp8266 + empty pads
Replies: 55
Views: 4111

Re: ebay 103c8t6 oled, nrf24, esp8266 + empty pads

First two pins are both tied to GND, that is normal.
by stevestrong
Fri Feb 02, 2018 5:13 pm
Forum: STM32F103 Boards
Topic: ebay 103c8t6 oled, nrf24, esp8266 + empty pads
Replies: 55
Views: 4111

Re: ebay 103c8t6 oled, nrf24, esp8266 + empty pads

If you got blue pills, then do not wonder, 2 out of 10 cheap boards are statistically "bad", showing not working USB, or not starting crystal.
by stevestrong
Sun Jan 28, 2018 8:41 am
Forum: General discussion
Topic: USB PMA addresses
Replies: 12
Views: 246

Re: USB PMA addresses

By the way, isn't it a bit strange that VCOM_RX_ADDR = VCOM_NOTIVATION_ADDR + 0x10, instead of VCOM_RX_ADDR = VCOM_NOTIVATION_ADDR + 0x40, given that the size of the VCOM_NOTIFICATION packet buffer is 0x40? Is this a bug? Or am I misunderstanding something about how all this works. This may be inde...
by stevestrong
Sat Jan 27, 2018 6:06 pm
Forum: General discussion
Topic: USB PMA addresses
Replies: 12
Views: 246

Re: USB PMA addresses

arpruss wrote:
Sat Jan 27, 2018 4:21 pm
I'm trying to understand how the USB peripheral works on stm32f1, and I've noticed that the Maple core allocates USB PMA buffers starting at offset 0x40 instead of at 0x00. Does anybody know why? Is the initial 0x40 reserved for something? (CAN?)
Any reference (link) to a document (core file)?
by stevestrong
Sat Jan 27, 2018 5:55 pm
Forum: STM32F103 Boards
Topic: [SOLVED] USB and Generic STM32F1 board. NOOB questions....
Replies: 12
Views: 442

Re: USB and Generic STM32F1 board. NOOB questions....

In order to reset the STM32 board and go to DFU mode the PC send a magic sequence over USB serial. So the upload only works if you use Serial (USB serial) in your actually running code. If you don't have USB serial in your code, the resetting must be done manually (or by un-plug->re-plug the USB cab...
by stevestrong
Sat Jan 27, 2018 5:21 pm
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: ricardo-reis: hello!
Replies: 14
Views: 306

Re: ricardo-reis: hello!

So, the modules i have are these: https://www.ebay.com/itm/1-2-5-10pcs-SPI-Reader-Micro-TF-SD-Memory-Card-Shield-Module-for-Arduino/182726191318 They're listed as operational with vcc between 3.3v and 5v. - i assume that would work with no changes. They can write what they want, but it will not mak...
by stevestrong
Sat Jan 27, 2018 9:02 am
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: ricardo-reis: hello!
Replies: 14
Views: 306

Re: ricardo-reis: hello!

SD should work on MM. You showed in the picture everything except the module which does not wok. That is not helpful. There are two different SD card modules: with and without 5V->3.3V converter. Since the MM works with 3.3V, you need an SD module without that power converter on board, like this one...